串联交替式炉膛高热值生物质气化炉数值模拟及试验研究

Numerical simulation and experimental research on tandem alternation chamber higher heating value gas biomass gasifier

对串联交替式炉膛高热值燃气生物质气化炉进行了研究,气化炉以木质颗粒为燃料、空气-水蒸气为气化剂,采用Fluent软件数值模拟了气化炉内水蒸气入口距离炉栅位置高度h、水蒸气入口流量Vs与空气入口流量V03个参数对燃气组分CO,H2和CH4体积浓度的影响。采用正交试验优化了上述3个参数,并试验测试了3个参数下燃气组分CO,H2和CH4体积浓度及燃气热值。数值模拟与试验结果表明,当h为175 mm,V0为0.92 m3/h,Vs为1.33 m3/h时,生物质燃气热值Q最大值为10.46 MJ/m3,比单一空气气化剂作用下提高了107.95%。

With woody particles as fuel and air-steam as gasification agent,the tandem alternation chamber high heating value gas biomass gasifier uses numerical value of software Fluent to simulate the impact of the three parameters,the position height ‘h＇ from the entrance of steam to the gasifier grate,the steam inlet flow Vsand the air inlet flow V0,on CO,H2 and CH4volume concentration. We use orthogonal test to optimize the three parameters mentioned earlier and test the volume concentration of CO,H2 and CH4and gas calorific value generated by gasification reaction under the condition of the three parameters. Numerical simulation and experimental results showed that when the position height‘h＇ is 175 mm,air inlet flow V0 is 0.92 m^3/h and the steam inlet flow Vsis 1.33 m^3/h,the combustion of biomass gas calorific value arrives its top,the value is Q =10.46 MJ/m^3,which is 107.95% higher than when single gas agent was used.